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Not a direct answer, but: on Kickstarter there are literally dozens of projects for custom decks many of them use Bicycle cards (Here a random one: kickstarter.com/projects/619318741/…). You could try contacting the creators and ask where they have them made.
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RoToRaMay 21 '13 at 14:40

2 Answers
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You could also check out Customized Playing Cards I had them make me a custom card game that came out amazingly. The paper quality they used was 310 GSM which is what bicycle playing cards uses. Honestly the customer service alone will make me be a repeat customer. There was a small hiccup in the very beginning but it was quickly resolved.